simple.mco

eXtremeDB数据库在Linux平台下的使用源码。内含多个示例程序

/******************************************************************
 *                                                                *
 * Copyright (c) 2001-2007 McObject LLC. All Right Reserved.      *
 *                                                                *
 ******************************************************************/

/* The simplest schema imaginable
 */

#define int1      signed<1>
#define int2      signed<2>
#define int4      signed<4>
#define int8      signed<8>
#define uint8     unsigned<8>
#define uint4     unsigned<4>
#define uint2     unsigned<2>
#define uint1     unsigned<1>

/* Object id is simply an unsigned long
 */
struct Id
{
	uint4 seq;
};

declare database  simple;
declare oid       Id[20000];

struct Dyn
{
	string s;
};
struct Fixed
{
	uint1 v1;
	uint2 v2;
	uint4 v4;
	uint8 v8;

};

/* The class supports object id and has four elements:
 * integers "a", b", string "c", and 4-byte integer h;
 * Two tree indexes are defined
 * - one is unique, another is non-unique;
 * One hash index is defined plus another
 * global hash index by objid is supported as well;
 * <list> declaration allows sequential cursors for the class
 */
class SimpleClass
{
	uint2             a;
	uint2             b;
	string            c;
	uint4             h;
	vector<uint2>     vint;
	vector<string>    vs;

	hash <h>                SimpleKey[20000];
	unique  tree <a, b, c>  Iabc;
	tree <b,c>              Ibc;
	list;

	oid;
};

/* Blobs
 */
class BlobClass
{
	blob blo;
	oid;
};

struct DynStruct
{
	string s;
};
struct FixedStruct
{
	uint1 v1;
	uint2 v2;
	uint4 v4;
	uint8 v8;
};

class Arrays
{
	int2                vint2[200];				  /* integer array */
	FixedStruct fs[200];
	DynStruct       ds[100];

	list;

};